Update perkamon to manpages 3.67

diff --git a/perkamon b/perkamon
index 1893ded..1db5d1a 160000 (submodule)
--- a/perkamon
+++ b/perkamon
@@ -1 +1 @@
-Subproject commit 1893dedbc496e95a45b804addd43f73a6d1ea355
+Subproject commit 1db5d1ae560b7b813ebab68a929c905cb8d0471a